Installation guide

5: Header Formats
DC 900-1564A 65
5.4 Control (Master or Control Access Mode Only)
Table 5–6 shows the DLI_PROT_CONTROL header format. See Section 4.2.4 on page 40 for
a functional description. There is no associated data area. Table 5–7 lists the supported
operator control options.
a
Requirements for non-DLI calls: ICP Header fields must be in network byte-order, Protocol Header
fields must be in client byte order, and the ICP Header
usICPCount field is required.
Table 5–6: DLI_PROT_CONTROL Header Format
Field Command Value (Write) Response Value (Read)
Freeway Header (network byte-order; used in DLI calls only):
usFWPacketType = FW_DATA = FW_DATA
usFWCommand = FW_ICP_WRITE = FW_ICP_READ
usFWStatus = 0 = 0
ICP Header
a
usICPClientID = 0 = 0
usICPServerID = 0 = 0
a
usICPCount = 16 (non-DLI calls only) = 16 (non-DLI calls only)
usICPCommand = DLI_ICP_CMD_WRITE = DLI_ICP_CMD_READ
iICPStatus = Client memory order
(Table 5–2 on page 61)
= DLI_ICP_CMD_STATUS_OK or
negative error code (slc_errs.h file)
usICPParms[0] = 0 = ICP return node from Attach cmd
usICPParms[1] = 0 = 0
usICPParms[2] = 0 = 0
Protocol Header
a
usProtCommand = DLI_PROT_CONTROL = DLI_PROT_CONTROL
iProtModifier = Operator control option (Table 5–7) = Operator control option (Table 5–7)
usProtLinkID = Link number = Link number
usProtCircuitID = SLC channel number (Table 5–7) = SLC channel number (Table 5–7)
usProtSessionID = Session ID from Attach response = Session ID from Attach response
usProtSequence = 0 = 0
usProtXParms[0] = 0 = 0
usProtXParms[1] = 0 = 0